// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/// @title: 自定义tab指示器（复制源码UnderlineTabIndicator，修改_indicatorRectFor和paint方法）
/// @creator: bryce
/// @create time: 2023年10月11日13:33:09

// NOTE 修改点，注释掉导包
// import 'package:flutter/widgets.dart';

// import 'colors.dart';

import 'package:flutter/material.dart';
import 'package:lib_uikit/lib_uikit.dart';
import 'package:lib_uikit/widgets/tabbar/gt_thirdly_tabbar_v3.dart';

/// Used with [TabBar.indicator] to draw a horizontal line below the
/// selected tab.
///
/// The selected tab underline is inset from the tab's boundary by [insets].
/// The [borderSide] defines the line's color and weight.
///
/// The [TabBar.indicatorSize] property can be used to define the indicator's
/// bounds in terms of its (centered) widget with [TabBarIndicatorSize.label],
/// or the entire tab with [TabBarIndicatorSize.tab].
class GTUnderlineTabIndicator extends Decoration {
  /// Create an underline style selected tab indicator.
  ///
  /// The [borderSide] and [insets] arguments must not be null.
  GTUnderlineTabIndicator({
    this.context,
    this.tabTitles,
    this.tabData,
    this.labelStyle,
    this.bracketsStyle,
    this.labelPadding,
    this.borderRadius,
    this.borderSide = const BorderSide(width: 2.0, color: Colors.white),
    this.insets = EdgeInsets.zero,
  });

  /// NOTE 修改点，新增属性
  BuildContext? context;

  /// NOTE 修改点，新增属性：所有tab标题
  List<String>? tabTitles;
  /// NOTE 修改点，新增属性：带icon的tab
  List<GTTabModalV3>? tabData;

  /// NOTE 修改点，新增属性：选中的tab的文案的style
  TextStyle? labelStyle;

  /// NOTE 修改点，新增属性：选中的tab中的小括号style
  TextStyle? bracketsStyle;

  /// NOTE 修改点，新增属性
  EdgeInsets? labelPadding;

  /// The radius of the indicator's corners.
  ///
  /// If this value is non-null, rounded rectangular tab indicator is
  /// drawn, otherwise rectangular tab indictor is drawn.
  final BorderRadius? borderRadius;

  /// The color and weight of the horizontal line drawn below the selected tab.
  final BorderSide borderSide;

  /// Locates the selected tab's underline relative to the tab's boundary.
  ///
  /// The [TabBar.indicatorSize] property can be used to define the tab
  /// indicator's bounds in terms of its (centered) tab widget with
  /// [TabBarIndicatorSize.label], or the entire tab with
  /// [TabBarIndicatorSize.tab].
  final EdgeInsetsGeometry insets;

  @override
  Decoration? lerpFrom(Decoration? a, double t) {
    if (a is GTUnderlineTabIndicator) {
      return GTUnderlineTabIndicator(
        borderSide: BorderSide.lerp(a.borderSide, borderSide, t),
        insets: EdgeInsetsGeometry.lerp(a.insets, insets, t)!,
      );
    }
    return super.lerpFrom(a, t);
  }

  @override
  Decoration? lerpTo(Decoration? b, double t) {
    if (b is GTUnderlineTabIndicator) {
      return GTUnderlineTabIndicator(
        borderSide: BorderSide.lerp(borderSide, b.borderSide, t),
        insets: EdgeInsetsGeometry.lerp(insets, b.insets, t)!,
      );
    }
    return super.lerpTo(b, t);
  }

  @override
  BoxPainter createBoxPainter([VoidCallback? onChanged]) {
    return GTUnderlinePainter(this, borderRadius, onChanged);
  }

  // NOTE 修改点，计算指示器宽度和中心点
  Rect _indicatorRectFor(Rect rect, TextDirection textDirection, {int? index}) {
    assert(rect != null);
    assert(textDirection != null);
    final Rect indicator = insets.resolve(textDirection).deflateRect(rect);
    // return Rect.fromLTWH(
    //   indicator.left,
    //   indicator.bottom - borderSide.width,
    //   indicator.width,
    //   borderSide.width,
    // );

    double targetWidth = 22;
    // 取中间坐标
    double centerX = (indicator.left + (labelPadding?.left ?? 0) + indicator.right - (labelPadding?.right ?? 0)) / 2;
    if (null != context && null != index && null != tabTitles && tabTitles!.length > index) {
      String currentTitle = tabTitles![index].trim();

      // 获取末尾小括号
      String? bracketsStr = TextUtils.getEndBrackets(currentTitle);
      if (TextUtils.isNotEmpty(bracketsStr)) {
        currentTitle = currentTitle.replaceAll(bracketsStr!, '').trim();
        // 括号宽度
        double bracketsWidth = TextUtils.calculateTextSize(context!, bracketsStr, textStyle: bracketsStyle).width;
        // 中心点向左偏移：偏移一半括号宽度
        centerX =
            GTThemeProvider.instance.isRTL() ? (centerX + bracketsWidth / 2 + 1) : (centerX - bracketsWidth / 2 - 1);
      }
      // 指示器宽度
      targetWidth = TextUtils.calculateTextSize(context!, currentTitle, textStyle: labelStyle).width;
    }

    /// NOTE 修改点，新增计算带有图片的tab宽度
    if (null != context && null != index && null != tabData && tabData!.length > index) {
      GTTabModalV3 currentTab = tabData![index];
      String currentTitle = currentTab.text.trim();

      // 获取末尾小括号
      String? bracketsStr = TextUtils.getEndBrackets(currentTitle);
      if (TextUtils.isNotEmpty(bracketsStr)) {
        currentTitle = currentTitle.replaceAll(bracketsStr!, '').trim();
        // 括号宽度
        double bracketsWidth = TextUtils.calculateTextSize(context!, bracketsStr, textStyle: bracketsStyle).width;
        // 中心点向左偏移：偏移一半括号宽度
        centerX =
        GTThemeProvider.instance.isRTL() ? (centerX + bracketsWidth / 2 + 1) : (centerX - bracketsWidth / 2 - 1);
      }
      double widgetWidth = 0.0;
      if (currentTab.widgetKey?.currentContext != null) {
        final RenderBox renderBox = currentTab.widgetKey?.currentContext!.findRenderObject() as RenderBox;
        widgetWidth = renderBox.size.width;
      }
      targetWidth = widgetWidth;
    }
    return Rect.fromLTWH(centerX - targetWidth / 2, indicator.bottom - borderSide.width, targetWidth, borderSide.width);
  }

  @override
  Path getClipPath(Rect rect, TextDirection textDirection) {
    if (borderRadius != null) {
      return Path()..addRRect(borderRadius!.toRRect(_indicatorRectFor(rect, textDirection)));
    }
    return Path()..addRect(_indicatorRectFor(rect, textDirection));
  }
}

class GTUnderlinePainter extends BoxPainter {
  GTUnderlinePainter(
    this.decoration,
    this.borderRadius,
    super.onChanged,
  ) : assert(decoration != null);

  final GTUnderlineTabIndicator decoration;
  final BorderRadius? borderRadius;

  @override
  void paint(Canvas canvas, Offset offset, ImageConfiguration configuration) {
    assert(configuration != null);
    assert(configuration.size != null);
    final Rect rect = offset & configuration.size!;
    final TextDirection textDirection = configuration.textDirection!;
    final Paint paint;
    if (borderRadius != null) {
      paint = Paint()..color = decoration.borderSide.color;
      final Rect indicator =
          decoration._indicatorRectFor(rect, textDirection).inflate(decoration.borderSide.width / 4.0);
      final RRect rrect = RRect.fromRectAndCorners(
        indicator,
        topLeft: borderRadius!.topLeft,
        topRight: borderRadius!.topRight,
        bottomRight: borderRadius!.bottomRight,
        bottomLeft: borderRadius!.bottomLeft,
      );
      canvas.drawRRect(rrect, paint);
    } else {
      paint = decoration.borderSide.toPaint()..strokeCap = StrokeCap.square;
      final Rect indicator =
          decoration._indicatorRectFor(rect, textDirection).deflate(decoration.borderSide.width / 2.0);
      canvas.drawLine(indicator.bottomLeft, indicator.bottomRight, paint);
    }
  }

  void paintIndicator(Canvas canvas, Offset offset, ImageConfiguration configuration, int index) {
    assert(configuration != null);
    assert(configuration.size != null);
    final Rect rect = offset & configuration.size!;
    final TextDirection textDirection = configuration.textDirection!;
    final Paint paint;
    if (borderRadius != null) {
      paint = Paint()..color = decoration.borderSide.color;
      final Rect indicator =
          decoration._indicatorRectFor(rect, textDirection, index: index).inflate(decoration.borderSide.width / 4.0);
      final RRect rrect = RRect.fromRectAndCorners(
        indicator,
        topLeft: borderRadius!.topLeft,
        topRight: borderRadius!.topRight,
        bottomRight: borderRadius!.bottomRight,
        bottomLeft: borderRadius!.bottomLeft,
      );
      canvas.drawRRect(rrect, paint);
    } else {
      paint = decoration.borderSide.toPaint()..strokeCap = StrokeCap.square;
      final Rect indicator =
          decoration._indicatorRectFor(rect, textDirection, index: index).deflate(decoration.borderSide.width / 2.0);
      canvas.drawLine(indicator.bottomLeft, indicator.bottomRight, paint);
    }
  }
}
